Brake-shoe.



Patented Sept'22,190 8.

B; 1 LOGKWOOD & r; M. WHYTE. BRAKE SHOE APPLXOATIOH FILED JULY 25 19! Qrrucssn (961411? I UNITED. STATES PATENT OFFICE.

BURNS'D. LOCKWOOD, OF IN DIANAPOLIS, INDIANA, AND FREDERIG M. \VHYTE, F TARRY- TOWN, NEW YORK.

Balms-snort.

No. 899,454. I V I Specification of Letters Patent. Patented Sept. 22, 1908.

Application filed July 25, 1908. Serial No. 445,291. I

T 0 all whom it may concern: brake shoe will have two lines of contact and Be it known that \VO,BUR.\'SD.LOCKWOOD, bearing on the wheel to which it is applied, of Indianapolis, in the county of Marion and whether the wheel be of large. or of. small di-' State of Indiana, and FREDERIC M. Wnr'rn, ameter, and, in the case of either wheel, these 65 of Tnrrytown, in the county of Westchester lilies of hearing will be on opposite sides of and State. of New York, have jointlyinv-ented and at e ual distances from, the middle 0 a certain new and useful Improvement in the shoe, and at such distances from the con- Bmke-Shoes, of which improvement the folncctions of the latter to the brake head as to lowingis a specification. 7 obviate li'ability to injurious strains upon the 60 10 The object of our invention is to provide a shoe. As the shoe wears down in service, the

brake shoe which will be. ad'aptable'to use on area of its ln'aringsurl'noe on the wheel tread wheels of various diameters, t ereby obviatwill be gradually and correspondingly ining the lmcessity of making nd keeping in creased in either case. stock, a special pattern and set ofv castings 'lhe speeilic number of plane surfaces 65 for each of the several diameters of locomowhich make up the. rubbing or wearing-face tive and car wheels in service on a rail-road. of the brake shoe,is not an essential of our inlhe improvement claimed is hereinafter vent-ion, as it may be greater or less in the fully set forth. discretion of those familiar with brake a pa- In the accompanying drawing: F igurel is rains; Neither is it essential that said p ane 70 a side view, in elevation, of a brake shoe surfaces should, as shown in the drawing, imillustrating an embodiment of our invention mediatelv adjoin each other, as their separa- Fig. 2, a face view of the same, and Fig. 3, a tion by short spaces or recesses'would not inview in perspective. volve any. departure from the principle and In the; ra'ctiee of our invention, we prooperative ellieiency of our invention. 75 vide a bra 'e shoe, A, which, except as to its \Ve claim as our invention and desire to serubbing or wearing face, to which only our incure by Letters Patent: vention relates, maybe of any of the various 1 A brake shoe having a plurality of relaknown types, and our invention consists in tively inclined flat or plane surfaces on its making said rubbing or wearing face in the rubbing or wearing face. form of a plurality of'fla-t or plane surfaces,- 12. A brake shoe having its rubbing or as 1, 1, 2, 2?, 3, 3, which are inclined in wearing face composed of a plurality of relapairs inwardly or in the direction of the curtively inclined flat or plane surfaces. vature ofthe tread ofthe wheel to which the 3. A brake shoe having atread wearing shoe is to be applied, at equal and progressface composed of a. plurality of relatively in- 85 ively'increasing angles in each pair, from the elincd flat or plane surfaces, and a flangemiddle of the shoe towards its ends. The. wearing face eoinposcdof a plurality of relausual flange, A, for providing frictional surtively inclined surfaces. face to act upon a wheel flange, may, when 4. A brake shoe ha ing, on its rubbing or desired, be formed on one side of the shoe, l wearing face, a plurality of flat or'plane sur- 90 40 and in such case, the face of the grooveof'the faces, which are inclined in pairs, inwardly or flangesimilarlycomprises a plurality of relatowards the curvature of a wheel tread, at

tively inclined surfaces,- each of which, while substantially semi-cylindrical in transverse section, presents a right line in longitudinal equal and progressively increasing angles in 1 each pair. p

- BURNS l). LOCKWOOD.

. l section at every part of its width, as in the F liEDElill .\I. W] IYTE.

. case of the plane tread bearing surfaces of the 1 Witnesses as to"! l). Lockwood:

shoe. A. U. CALDWELL,

By reference to the curved lines 1-1 and l J. E. BAKER.- y y of Fig. 1, which indicate, respectively, Witnesses as to F. M. Whytc: the contour of awheel tread of a large and of G when A. PRICE, a small diameter, it will be seen that the l Jomv J. Down.

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